diff --git a/requirements.txt b/requirements.txt
index 6608038..d1b1a24 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ jsonschema==2.6.0
 lxml==4.3.0
 MarkupSafe==1.1.0
 marshmallow==2.17.0
-mistune==0.8.4
+mistune==2.0.3
 pytz==2018.7
 PyYAML==3.13
 redis==3.0.1